2. For the system shown below, design the complete OC protection using the IDMT relays. Thus, decide the CT ratios, the plug settings and the TMS at all locations. Load Minimum fault current Maximum fault current 115 A 1500 A 80 A 1000 A 5000 A 3000 A 100 A 780 A 77 A 70 585 A 2000 A 390 A 6000 A 1000 A
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- Q/The generating set lines L1 and L2 are connected to bus-bar A. L2 is supplied from a powerful system and L1 is supplying an important industrial plant. A fault is detected in CB1; preventing the circuit from opening, explain how the voltage at CB1 can be reduced to zero, so that repair can be carried out, without interrupting the supply to the important industrial plant.A bolted line to line short circuit is used to determine the thermal withstand rating of the cables and the breaking capacity setting of a circuit breaker Select one: True FalseThe Electricity Company of Ghana (ECG) has set up a system for reporting power supply faults in the Greater Kumasi Area, including high or low voltage and frequent power outages. Customers can contact ECG customer service and report their issue, providing their ECG pole reference number. The faults are recorded and sent to the ECG Fault Office for action. However, there is a delay in resolving the faults, and clients have to make several follow-up calls to check on the status of their complaints. The ECG management team conducted a survey and found out that customers want their faults resolved within three hours, and any delay beyond that is unacceptable. The team is looking for a solution that will offer a seamless experience to customers and minimize time and effort wasted. a) Given the information above, and making reasonable assumptions, model the current (‘AS IS’) and explain business processes at ECG Fault Office.…
- The Electricity Company of Ghana (ECG) has set up a system for reporting power supply faults in the Greater Kumasi Area, including high or low voltage and frequent power outages. Customers can contact ECG customer service and report their issue, providing their ECG pole reference number. The faults are recorded and sent to the ECG Fault Office for action. However, there is a delay in resolving the faults, and clients have to make several follow-up calls to check on the status of their complaints. The ECG management team conducted a survey and found out that customers want their faults resolved within three hours, and any delay beyond that is unacceptable. The team is looking for a solution that will offer a seamless experience to customers and minimize time and effort wasted. a) Given the information above, and making reasonable assumptions, model the current (‘AS IS’) and explain business processes at ECG Fault Office. b)What would the future state (ASTOBE) look like?Provide a new…8.In a line-by-line failure we can expect Immersive reader A) Currents exist in the ground connections. B) The current values at the ground connections are zero. C) Short-circuit currents exist in all three phases. D) The voltages at the fault point with respect to ground are zero in the faulted phases. E) N. A.Three fourth of the faults that take place in a transmission system is a. Zero sequence fault b. Transient fault c. Mechanical fault d. Electrical fault
- 7.In a line-to-ground fault we can expect that A) There are no currents to ground. B) The voltages at the fault point with respect to ground are zero in all three phases. C) The current in the faulted phase flows to ground. D) There are short circuit currents in all three phases. E) N. A.A protection system engineer is planning to provide the complete protection, he can achieve this by ___________ a. two phase fault relays and three earth fault relays b. a two phase fault relays and three earth fault relays c. three phase fault relays and two earth fault relays d. a two phase fault relays and two earth fault relaysFigure 2 shows the circuit of a simple power system. The ratings of the generators, transformers and the motors are as shown in the figure. The reactance of lines 1 and 2 are 40 ohms and 50 ohms respectively. Assume that system is unloaded, and the generators are generating their rated voltage. Select the generator G₁ ratings as base values. Choose the fault location in bus 1 And give the below answers For a symmetrical three phase fault on the bus (a).Determine the Thevenin's equivalent circuit which can be used to calculate the fault current. (b) Calculate the fault current contribution from the generator connected to the bus on which you have selected for fault calculation
- With the aim of a schematic, explain the principle of high impedance busbar protection. Answer in handwritten only for like and in short.Consider the one-line diagram of power system shown below; a) Develop equivalent circuit expressing all parameters in per unit values select Sbase= 100MVA b) Apply circuit reduction techniques and then find the net impedance(Zeq) at point of fault F2 c) Calculate fault level and fault current(a) Describe how TLBs are used to increase paging efficiency.